@MaxTemkin Mazzer has commerical options, you can go lower end since you don't need consistent espresso fineness

Impress your caffeine-loving customers with a Mazzer Super Jolly Low RPM Commercial Burr Grinder on your counter. It's designed with top-of-the-line functionality that can handle grinds for hundreds of cups of coffee a day. The Super Jolly is an ideal grinder for every coffee style from super fine to exceedingly coarse. Mazzer gave its Super Jolly a stepless adjustment control, which allows for on the fly adjustment of the grind, plus a doser that allows between 5.5g and 9.0g of grounds to be dispensed at a time.